drivers/video/fbdev/q40fb.c

   1 /*
   2  * linux/drivers/video/q40fb.c -- Q40 frame buffer device
   3  *
   4  * Copyright (C) 2001
   5  *
   6  *      Richard Zidlicky <rz@linux-m68k.org>
   7  *
   8  *  This file is subject to the terms and conditions of the GNU General Public
   9  *  License. See the file COPYING in the main directory of this archive for
  10  *  more details.
  11  */
  12
  13 #include <linux/kernel.h>
  14 #include <linux/errno.h>
  15 #include <linux/string.h>
  16 #include <linux/mm.h>
  17 #include <linux/delay.h>
  18 #include <linux/interrupt.h>
  19 #include <linux/platform_device.h>
  20
  21 #include <linux/uaccess.h>
  22 #include <asm/setup.h>
  23 #include <asm/q40_master.h>
  24 #include <linux/fb.h>
  25 #include <linux/module.h>
  26 #include <asm/pgtable.h>
  27
  28 #define Q40_PHYS_SCREEN_ADDR 0xFE800000
  29
  30 static struct fb_fix_screeninfo q40fb_fix = {
  31         .id             = "Q40",
  32         .smem_len       = 1024*1024,
  33         .type           = FB_TYPE_PACKED_PIXELS,
  34         .visual         = FB_VISUAL_TRUECOLOR,
  35         .line_length    = 1024*2,
  36         .accel          = FB_ACCEL_NONE,
  37 };
  38
  39 static const struct fb_var_screeninfo q40fb_var = {
  40         .xres           = 1024,
  41         .yres           = 512,
  42         .xres_virtual   = 1024,
  43         .yres_virtual   = 512,
  44         .bits_per_pixel = 16,
  45         .red            = {6, 5, 0},
  46         .green          = {11, 5, 0},
  47         .blue           = {0, 6, 0},
  48         .activate       = FB_ACTIVATE_NOW,
  49         .height         = 230,
  50         .width          = 300,
  51         .vmode          = FB_VMODE_NONINTERLACED,
  52 };
  53
  54 static int q40fb_setcolreg(unsigned regno, unsigned red, unsigned green,
  55                            unsigned blue, unsigned transp,
  56                            struct fb_info *info)
  57 {
  58     /*
  59      *  Set a single color register. The values supplied have a 16 bit
  60      *  magnitude.
  61      *  Return != 0 for invalid regno.
  62      */
  63
  64     if (regno > 255)
  65             return 1;
  66     red>>=11;
  67     green>>=11;
  68     blue>>=10;
  69
  70     if (regno < 16) {
  71         ((u32 *)info->pseudo_palette)[regno] = ((red & 31) <<6) |
  72                                                ((green & 31) << 11) |
  73                                                (blue & 63);
  74     }
  75     return 0;
  76 }
  77
  78 static struct fb_ops q40fb_ops = {
  79         .owner          = THIS_MODULE,
  80         .fb_setcolreg   = q40fb_setcolreg,
  81         .fb_fillrect    = cfb_fillrect,
  82         .fb_copyarea    = cfb_copyarea,
  83         .fb_imageblit   = cfb_imageblit,
  84 };
  85
  86 static int q40fb_probe(struct platform_device *dev)
  87 {
  88         struct fb_info *info;
  89
  90         if (!MACH_IS_Q40)
  91                 return -ENXIO;
  92
  93         /* mapped in q40/config.c */
  94         q40fb_fix.smem_start = Q40_PHYS_SCREEN_ADDR;
  95
  96         info = framebuffer_alloc(sizeof(u32) * 16, &dev->dev);
  97         if (!info)
  98                 return -ENOMEM;
  99
 100         info->var = q40fb_var;
 101         info->fix = q40fb_fix;
 102         info->fbops = &q40fb_ops;
 103         info->flags = FBINFO_DEFAULT;  /* not as module for now */
 104         info->pseudo_palette = info->par;
 105         info->par = NULL;
 106         info->screen_base = (char *) q40fb_fix.smem_start;
 107
 108         if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) {
 109                 framebuffer_release(info);
 110                 return -ENOMEM;
 111         }
 112
 113         master_outb(3, DISPLAY_CONTROL_REG);
 114
 115         if (register_framebuffer(info) < 0) {
 116                 printk(KERN_ERR "Unable to register Q40 frame buffer\n");
 117                 fb_dealloc_cmap(&info->cmap);
 118                 framebuffer_release(info);
 119                 return -EINVAL;
 120         }
 121
 122         fb_info(info, "Q40 frame buffer alive and kicking !\n");
 123         return 0;
 124 }
 125
 126 static struct platform_driver q40fb_driver = {
 127         .probe  = q40fb_probe,
 128         .driver = {
 129                 .name   = "q40fb",
 130         },
 131 };
 132
 133 static struct platform_device q40fb_device = {
 134         .name   = "q40fb",
 135 };
 136
 137 int __init q40fb_init(void)
 138 {
 139         int ret = 0;
 140
 141         if (fb_get_options("q40fb", NULL))
 142                 return -ENODEV;
 143
 144         ret = platform_driver_register(&q40fb_driver);
 145
 146         if (!ret) {
 147                 ret = platform_device_register(&q40fb_device);
 148                 if (ret)
 149                         platform_driver_unregister(&q40fb_driver);
 150         }
 151         return ret;
 152 }
 153
 154 module_init(q40fb_init);
 155 MODULE_LICENSE("GPL");